Water-resistant surface sizing agent as well as preparation method and application thereof

A surface sizing agent and water-resistant technology, which is applied in the direction of adding water repellent to achieve the effect of improving water resistance, reducing Cobb value and strengthening bonding force

Pending Publication Date: 2022-03-11
SHANGHAI DONGSHENG NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The water resistance of these sizing

Method used

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  • Water-resistant surface sizing agent as well as preparation method and application thereof
  • Water-resistant surface sizing agent as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0026] Example 1

[0027] Preparation of water resistant surface sizing agent:

[0028] 20 grams of oxidation of starch, 190 g of deionized water were mixed together, and the four flask was added to 40 ° C, and 6 g of liquid base was added, and the pH to 11 or more, the temperature was tapered to 70 ° C, and the reaction was 30 min, and 16 g of formaldehyde solution, After 4 HR, 150 g of deionized water was added; heated to 90 ° C, 2.5 g of potassium sulfate, and dripped the mixed monomer (100 g styrene, 60 g of acrylate) 1.5HR. 0.7 g of ammonium sulfate, 140 g of deionized aqueous solution was added dropwise, and 2HR was added dropwise. After the dropwise addition was completed, the reaction was continued for 1HR. After cooling, the surface sizing agent was filtered with a 325 mesh filter, pH = 3.4, solid content = 27.8%.

Example Embodiment

[0029] Example 2

[0030] Preparation of water resistant surface sizing agent:

[0031] 30 grams of oxidation of starch, 200 grams of deionized water were mixed together, and the four flask was raised to 45 ° C, and 9 g of liquid base was added, and the pH to 11 or more, the temperature was increased to 75 ° C, and 16 g of propylene oxide was added. After the reaction 4HR, 150 g of deionized water was added; the temperature was tapered to 90 ° C, and 0.4 g of ammonium sulfate was added, and the mixed monomer (100 g of styrene, 70 g of acrylate) was added dropwise, and completed after 10 minutes. 0.8 g of ammonium sulfate, 150 g of deionized aqueous solution was added dropwise, and 2HR was added. After the dropwise addition was completed, the reaction was continued for 1HR. After cooling, the surface sizing agent was filtered with a 325 mesh filter, pH = 3.7, solid content = 28.2%.

Example Embodiment

[0032] Example 3

[0033] Preparation of water resistant surface sizing agent:

[0034] 40 grams of oxy starch, 200 grams of deionized water were mixed together, and the four flask was added to 45 ° C, and 10 g of liquid base was added, adjusted pH to 11 or more, heated to 65 ° C, after 30min, 12 g of epoxy chloride Propylene, reaction 4HR, 160 g of deionized water; heating to 90 ° C, add 2.5 g of tert-butyl hydrogen peroxide, reflecting a mixed monomer (100 g styrene, 75 g of butyl butyl butyl butyl butyl butyl butyl butyl butter) 1.5 hr drop Finish. The mixture was added dropwise addition of 3.0 g of tert-butyl hydrogen peroxide, 150 g of deionized aqueous solution, and 2HR was added. After the dropwise addition was completed, the reaction was continued for 1HR. After cooling, the surface sizing agent was filtered through the 325 mesh filter, pH = 3.6, solid content = 27.4%.

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Abstract

The invention provides a water-resistant surface sizing agent. A preparation method of the water-resistant surface sizing agent comprises the following steps: mixing oxidized starch and water, heating, adding caustic soda liquid, adjusting the pH value to 11 or above, continuously heating to 60-80 DEG C, and adding a cross-linking agent for reaction to prepare cross-linked oxidized starch; mixing the cross-linked oxidized starch with water, heating to 80-90 DEG C, and adding an initiator; dropwise adding (methyl) styrene and (methyl) acrylate monomers, reacting, cooling, and discharging to obtain the water-resistant surface sizing agent. A sizing solution obtained by compounding the water-resistant surface sizing agent and gelatinized oxidized starch is used for paper surface sizing, the water resistance of paper can be greatly improved, and the Cobb value of the paper is reduced.

Description

Technical field [0001] The present invention relates to the field of papermaking surface sizing, and more particularly to a water-resistant surface sizing agent and a preparation method thereof. Background technique [0002] Domestic corrugated material production is mostly used in waste paper, because there is more impurities, the water resistance is poor. Methods of surface sizing are often used to improve the water resistance of corrugated materials. In recent years, various types of surface sizing agents have developed rapidly, especially in synthetic polymeric surface sizing agents, with their excellent sizing effect and printing properties a hot spot of current research. However, natural polymeric surface sizing agents represented by modified starch will still have a large proportion of their usage in a long time due to low price, easy degradation, non-pollution, etc. And the starch molecular structure is extremely similar to the molecular structure of the paper fibers, and...

Claims

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Application Information

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IPC IPC(8): C08F251/00C08F212/08C08F220/18C08B31/18D21H21/16
CPCC08F251/00C08B31/185D21H21/16C08F212/08C08F220/1804
Inventor 施晓旦谢中怡尹东华
Owner SHANGHAI DONGSHENG NEW MATERIALS
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